1.8" wireless digital clocks, 2 sided ceiling mount. Super-bright 7 segment red LED for high readability. Non-glare lens. Selectable 12 or 24-hour format. 10-year Lithium battery maintains correct time during power failure. Selectable automatic daylight saving time correction. ±1 second accuracy to master. Black anodized aluminum frame. Supplied with an internal transformer. Popular in large areas, long hallways and meeting rooms, wireless digital clock are available in various sizes and time formats to meet specific needs. These wireless digital clocks are intended for use with SiteSync IQ® wireless clock system.